This PDF file includes:

• table S1. Model of the observed light attenuation coefficient.
• table S2. Linear regression analyses of the depth-specific light attenuation coefficient versus fluorescence or dissolved oxygen.
• fig. S1. The observed depth-specific light attenuation coefficient versus that approximated from the multiple regression model.
• fig. S2. DSL distribution along the cruise track.
• fig. S3. Association between the depth-specific light attenuation coefficient and the dissolved oxygen concentration.
• fig. S4. Observations of fluorescence, dissolved oxygen concentration, and depth-specific light attenuation coefficient.

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